NARRATIVE OF THE CRUISE. 



287 



their habit, and the Challenger Expedition occupied itself mainly with deep-sea dredging. 

 About eighty specimens were collected, which are referable to some twenty-eight species, 

 of which four were previously undescribed, and two are described in the late Dr. P. P. 

 Carpenter's MS. 



"The distribution' of the shore Chitons is now fairly well known. The specimens 

 collected by the Expedition present us with no new features of interest, and, un- 

 fortunately, an insufficient number was collected to give instructive series. 



" Three species of Chitonellidae were collected, viz., Cryptoiplax striatus, Lam., 

 Chitonellus fasciatus, Quoy and Gaim., and Chitonellus oculatus, Quoy and Gaim. There 

 has been much confusion concerning this last species, chiefly owing to the fact of Peeve 

 describing a Cryptoplax striatus under that name. Quoy and Gaimard's description 

 is sufficiently lucid, but unfortunately they only figure the under surface and one 

 separate valve. It is therefore very satisfactory to be able to restore this beautiful 

 lost species. 



'.' The deep-sea Chitons belong mostly to the genus Leptochiton. The following is a 

 list of the species collected by the Expedition of that genus. 



"It is interesting to find that the only really deep-sea captures both belong, to the 

 same species, Leptochiton alveolus, Sars. The following localities have been recorded 

 for this species : — 



" Bergen, Lofoten, Finmark, 150 to 300 fathoms (Sars). 



" Gulf of St. Lawrence, off Cape Rosier, 220 fathoms (Whiteaves). 



" Gulf of Maine, 150 fathoms (U.S. Fish Commission, 1872, Dall). 



" East Coast of United States, ' ranges northwards along the American coast, beyond 

 New England waters,' 99^ to 640 fathoms (Verrill). 



" North Pacific (P. P. Carpenter, MS.). 



"This species has thus hitherto only been recorded from Scandinavia (150 to 300 

 fathoms) and the northeast coast of North America in the region swept by the 

 Arctic currents (99 to 640 fathoms). Carpenter's MS. locality is very vague. W. H. 

 Dull has described a very closely allied species, if indeed it be really distinct, Leptochiton 



